From 63ce99c6f8a8dcbe9b739989362aac527202c110 Mon Sep 17 00:00:00 2001
From: Michael Hewson <michael@michaelhewson.ca>
Date: Thu, 14 Dec 2017 18:51:25 +0100
Subject: [PATCH] add a ui test for the inference variable warning

---
 .../ui/inference-variable-behind-raw-pointer.rs   | 15 +++++++++++++++
 .../inference-variable-behind-raw-pointer.stderr  |  8 ++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 src/test/ui/inference-variable-behind-raw-pointer.rs
 create mode 100644 src/test/ui/inference-variable-behind-raw-pointer.stderr

diff --git a/src/test/ui/inference-variable-behind-raw-pointer.rs b/src/test/ui/inference-variable-behind-raw-pointer.rs
new file mode 100644
index 000000000000..f2065ae6a1ac
--- /dev/null
+++ b/src/test/ui/inference-variable-behind-raw-pointer.rs
@@ -0,0 +1,15 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+fn main() {
+    let data = std::ptr::null();
+    let _ = &data as *const *const ();
+    if data.is_null() {}
+}
diff --git a/src/test/ui/inference-variable-behind-raw-pointer.stderr b/src/test/ui/inference-variable-behind-raw-pointer.stderr
new file mode 100644
index 000000000000..b0aa21cf5f5f
--- /dev/null
+++ b/src/test/ui/inference-variable-behind-raw-pointer.stderr
@@ -0,0 +1,8 @@
+warning[E0619]: the type of this value must be known in this context
+  --> $DIR/inference-variable-behind-raw-pointer.rs:14:13
+   |
+14 |     if data.is_null() {}
+   |             ^^^^^^^
+   |
+   = note: this will be made into a hard error in a future version of the compiler
+